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The study is used real data and simulative data to compare with parameter''s estimate accuracy of IRT software BILOG-MG, ICCNP, MULTILOG & PARSCALE. The research uses two simulation studies .The ability parameter and item parameter were obtained by BILOG-MG analyzing real data in the first simulation study.Supposeing ability parameter,discrimination parameter&difficulty parameter are normal distribution and guessing parameter equal 0.25 in the second simulation study.There are five different numbers of examines:100,200,500,1000&2000. There are three different numbers of items:10,25&50. Listed below is the main result of this study. 1.To use ICCNP is easier. Running both of BILOG-MG and PARSCALE are similar .MULTILOG is the most difficult than the others . 2.ICCNP is better than the others'' IRT software for the estimate of ability in the first simulation study. When item numbers are 10, BILOG-MG is better than the others.When item numbers are 25,the difference between BILOG-MG and MULTILOG is almost the same. ICCNP is secondary , PARSCALE is last. 3.Comparing to BILOG-MG,MULTILOG &PARSCALE, BILOG-MG is the most accuracy and steady for the estimate of item parameter.
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