This research platform to verification on Matlab and achieve on Opencv，In this paper we presents a method to abtain face direction angle coefficients by using the Karhunen-Lo?ve Transform(KLT)，we explore first coefficients and second coefficients after the behavior and the relationship between the angle measurements 。And regression cosefficients of the first feature corresponding to the angle of the equation。 The Curve equation regression coefficients to test at least 3 to 6 power ，However ， the 5-th power of curve equation is the mostefficiency and accuracy can be achieved the best results 。In addition， the resolution of load into image curve of the coefficient is not much interference 。Therefore, we will transform the minimum image resolution 50x50 after using only one first featurein the case. The angel measurement error of average angel accuracy of equation returen in the case is 1.7 degree
