To explore the present status of Critical thinking and its relevant factors among undergraduates.A stratified random sampling was used to select 1013 undergraduates from 7 full-time colleges in Guangdong province. They were investigated with California Critical Thinking Disposition Inventory-Chinese Version (CTDI-CV) and a Self-Compiled Personal General Information Questionnaire. ⑴ The total score of CTDI-CV was (254.16±38.80). The undergraduates in the four levels of critical thinking of comprehensive strong, relatively strong, contradictory scope and serious opposition accounted for 1.78%, 5.31%, 87.4% and 5.51% of this group, respectively. (2) Multiple stepwise linear regression showed that the total score of CTDI-CV was positively correlated with the following 10 factors such as grade, family economic status, part-time experience, the teaching method used most commonly, like reading logic books, like reading reviews or essays, father’s warmth, mother’s warmth, openness and responsibility (β=.142 to .701,all P<.05). The following 5 factors such as father’s negation, father’s overprotection, mother’s negation, mother’s overprotection and neuroticism were negatively correlated with the total score of CTDI-CV (β=-.381 to -. 616, all P < 0.05). The overall level of critical thinking among undergraduates is relatively low. College Students' critical thinking may be related to many factors such as family rearing, school education and personal characteristics.