Abstarct: The main purpose of this study is determination of effective factors on Stock Price Crash Risk and investigating the effect of effective factors on stuck price crash risk on the level of different internal and external studies. In this regard, the researcher has used the criterion of the negative skewness of stock returns to measure the stock price crash risk. The statistical population of this study consists of 32 internal studies and 52 external studies. In order to achieve the purpose of the research, mexta - analysis method has been used. The results showed that internal effectiveness controls variables; ownership concentration, dividends, financial transparency, managerial and conservative ownership have a meaningful and negative effect on stock price crash risk. On the other hand, firm size equity overvaluation, institutional ownership, development opportunities and perceived assets have meaningful and positive effect on the risk of stock price crash, baxsed on the obtained results of internal researches. Also, the variables of the board of directors, the ratio of book value of stock market value equity, conservatism and equity return on the basis of external studies have shown significant and negative effects on the risk of stock price crash fall, and finally, the variables of abnormal accruals, changes in the average monthly turnover of stocks ,institutional investors, financial leverage, Price to book value ratio, average monthly stock returns and firm size have positive and meaningful baxsed on the results of external researches.