There is significant heterogeneity among travelers＇evaluation on in-vehicle congestion． The impact of in- vehicle congestion was studied with the random parameters Logit model． In view of the impact of the latent psycho- logical factor on travelers＇mode choice，travelers＇demand of comfort was taken into account ． The results show that the random parameters Logit model fit the data much better than the traditional discrete choice model． From the re- sult，it can be concluded that，the parameters of price and in-vehicle time are non-random． However，the parame- ter of in-vehicle congestion is random，and it is affected by travelers＇demand of comfort when traveling and in-vehi- cle time． The impact of in-vehicle congestion increases as travelers＇ demand of comfort increases，and decreases when in-vehicle time increases．