Many people criticize students from rich family get much benefit of multiple entrance program and the educational opportunity is unequal so that some people suggest to return to the joint entrance examination. Nonetheless, is it true that the joint entrance examination is less influenced by social economic background and more accord with the equality of educational opportunity? It needs empirical data to evidence. This study analyzes the national samples from “Taiwan Education Panel Survey (TEPS)” and the results are stated as follows: Students with higher social economic backgrounds have more opportunities to enter public and famous private senior high school in multiple entrance program than the lower ones. They have more opportunities to enter public senior high schools through the joint entrance examination and enter private famous senior high schools through the direct entry, and their grades in senior high school are better. Students with lower social economic backgrounds have few opportunities in those two ways, and many of them enter private senior high schools by application or admission and their grades in senior high school are lower, but the opportunity of entering public senior high schools through recommendation and screening is no less than students with higher social economic background. The direct entry is the most unequal way. Students from rich family can directly enter private expensive high schools that are beneficial to enter high-level college in the future. Therefore, the students with higher social economic backgrounds have more opportunities for the joint entrance examination, so return to the joint entrance examination may not probably reduce the inequality of educational opportunity.