AVO technology is an effective method in predicting and deciding the fluid properties and lithology of the reservoir. To make the response characteristics clearer and the inversion of AVO analysis and lithologic parameter easier, according to the approximate valuation of reflection coefficient on P-SV wave, the paper carried out quantitative calculation on four theoretical models respectively, and precise comparative analysis with the exact solution of Zoeppritz equation. At last, four AVO models were used in forward modeling of P-SV and the fundamental factors on affecting the response characterizes of converted wave AVO were analyzing in detail which is significant to the improvement of precision and the reduction of interpretation ambiguity on AVO inversion based on AVO.