In order to solve the problems of low precision and difficult weight determination of the traditional direction finding method based on time difference of arrival， a method is proposed to calculate the intersection point by rotating coordinate system and weighting different intersection parameters according to GDOP. Through the rotation of coordinate system， the analytic solutions of two nonlinear equations about two unknown variables， namely azimuth angle and elevation angle， are obtained， which improves the problem of low accuracy of direction finding at curve intersection； compared with the traditional weighted method， the WI method with GDOP index comprehensive weighted estimation is more accurate for target position estimation. Simulation results show that the performance of the algorithm with three different weighting methods is verified. According to the experimental results， the WI method with comprehensive weighted estimation is closer to the Cramer-Rao Lower Bound， which improves the accuracy of intersection estimation and which has higher positioning performance.