主题：持仓没有变化，怎么avgenterprice的值会改变呢

我打印出来avgenterprice的值，发现持仓没有变化（还是2手多单），但是avgenterprice的值却从2500.68变成了2500.37

2013-04-19 10:30:37.968    多盈条件  H:2505.00 HIGHPRICE:2505.00 avgenterprice:2500.68 HIGHPRICE-AVGENTERPRICE:4.32 win*mindiff:6.00 HIGHPRICE-H:0.00 win_back2.00
2013-04-19 10:30:37.968      多损条件  c:2502.80  avgenterprice:2500.68  AVGENTERPRICE-c:-2.12  20*mindiff:4.00
2013-04-19 10:30:39.468    多盈条件  H:2505.60 HIGHPRICE:2505.60 avgenterprice:2500.37 HIGHPRICE-AVGENTERPRICE:5.23 win*mindiff:6.00 HIGHPRICE-H:0.00 win_back2.00
2013-04-19 10:30:39.468      多损条件  c:2502.80  avgenterprice:2500.37  AVGENTERPRICE-c:-2.43  20*mindiff:4.00
2013-04-19 10:30:40.984    多盈条件  H:2505.60 HIGHPRICE:2505.60 avgenterprice:2500.37 HIGHPRICE-AVGENTERPRICE:5.23 win*mindiff:6.00 HIGHPRICE-H:0.00 win_back2.00
2013-04-19 10:30:40.984      多损条件  c:2502.40  avgenterprice:2500.37  AVGENTERPRICE-c:-2.02  20*mindiff:4.00