Abstarct: The rock mass boreability index is an important parameter that reflects the interaction between the rock mass and the cutting tool so it is related to the penetration rate of Tunnel Boring Machine (TBM) and the factors affecting the penetration rate, boreability is also effective. The angle and orientation of the joint plane are two factors which affect the boreablitiy index of the jointed rock mass when using a TBM. This study aims to effects of Joint Orientation and Spacing on the boreability index and present a new model and classification system for predict the FPI focusing on field studies. In this regard, a databaxse of four water conveyance projects, Queens conveyance Tunnel in USA, Kerman conveyance Tunnel in Iran, zagros conveyance (lot 2) in Iran and Maroshi-Vakola conveyance Tunnel in India was provided. At first in Kerman Tunnel, for this purpose, the joint parameters (orientation, spacing, persistence) affecting the boreability have initially been investigated. Then, the total fracturing factors (Bruland) and Persistence classification were used to investigate the effects of all three parameters on the borability. The results showed that the boreability is also increased by increasing the joint persistency. Besides, the effect of fracturing factor on boreability increases by increasing the joint persistency. In this paper, a new parameter called "Rock Joint Index"(RJI) is also presented according to the analysis performed on the databaxse. The boreability value estimated baxsed on the RJI shows a good agreement with the actual penetration rates. In the continue, investigation the combined effects of the Joint Orientation and Spacing on the boreability in databaxse. The results showed that the increase in total fracturing factor will result in higher boreability. A model was developed for predicting the boreability of the jointed rock mass baxsed on the total fracturing factor and the convergence coefficient of this model was 0.7. The volumetric joint count classification system was also developed to analyze the relationship between the total fracturing factor and the volumetric joint count. In order to predict the boreability of the jointed rock mass in Zagros tunnel in Iran the boreability was classified in three catagories. The result showed a good agreement between the predicted and actual boreability of the jointed rock mass. In this study, presented a new model for perdicachion od boreability the baxses of punch penetration test. Tis model is with a convergence coefficient of 0.68. To verify the new index, a PPT was performed on a number of other samples from different sections of the tunnel and the new index was compared with the PSI index (presented by Mr. Yagiz) and the PLI index (presented by Mr. Jing). The results show that the correlation coefficient of the new index with actual boreability index is higher in comparison with the other two indexes. The effect of two geometric properties of joints on boreability using numerical modeling using ABAQUS 6-14software has also been investigated. Then joints with angle and spacing defrent are considered in the model. Is. The results indicate that in the joint with an angle between 40 to 65 degrees, the vertical and rolling force is reduced, so it is expected to increase the porosity of the joint. If in the angle between 40 to 65 degrees, in addition to the effect of angle, we also consider the effect of spacing, it is observed that with increasing spacing, vertical and rolling force increases.