采用由研究者所修订的数学焦虑量表和自行设计的估算问题，通过对大学生被试进行团体测验，考察了在纯数字运算和应用题两种情境中数学焦虑对估算加工的影响以及估算中的问题大小效应。结果显示：（1）数学焦虑情绪在纯数字与应用题两种情境下都对估算有显著影响；（2）情境对估算准确率影响显著，纯数字情境下的估算准确率显著高于应用题情境；（3）在应用题情境估算中发现明显的问题大小效应，在纯数字情境估算中却未发现该效应。

In order to explore the impact of math anxiety and problem type on computational estimation and to investigate the problem-size effect in computational estimation, 388 participants was tested with Revised Mathematics Anxiety Rating Scale（R—MARS） and self-designed multiplication estimation questions. The results showed that 1) math anxiety has a significant impact on computational estimation in two different contexts; 2) the accuracy of estimation was significantly different in different contexts. In particular, the accuracy in pure digital context is remarkably higher than in word problem context; and 3) problem-size effect in computational estimation was found in word problem context, but not in pure digital context