Bartlett spherical test method is based on correlation coefficient matrix. Its zero assumes that the correlation coefficient matrix is a identity matrix, that is, all elements on the diagonal of the correlation coefficient matrix are 1, and all elements on the off-diagonal are zero. According to the determinant of correlation coefficient matrix, the statistics of bartlett spherical test method are obtained. If the value is large and the corresponding correlation probability value is less than the specified significance level, the null hypothesis is rejected, indicating that the correlation coefficient matrix is not identity matrix, and there is correlation between the original variables, which is suitable for principal component analysis; On the contrary, the null hypothesis holds, there is no correlation between the original variables, and the data is not suitable for principal component analysis.