Basically I agree with your plan.是什么意思？

Basically I agree with your plan.

我基本上同意你的计划。

basically

adv. 主要地，从根本上说，基本，基本上，总的说来；

例句
This gun is designed for one purpose—it's basically to kill people...
这种枪只有一个用途——就是用来杀人。

agree

vt.& vi. 同意，赞

例句
You and I are going to have to agree to disagree then.
那你我只能各自保留不同意见了。

with

prep. 和，跟，随着，关于，和…一致；

例句
A waiter entered with a tray...
侍者端着托盘进来了。

your

pron. 你的，你们的，尊，玉，乃；

例句
I think there's something a little peculiar about the results of your test.
我认为你的化验结果有点不对劲。

plan

n. 计划，打算，平面图，示意图；vt.& vi. 计划，打算，设计；

例句
He's already altered several of the proposals in his economic plan to accommodate demands of special interests.
他已经改动了经济计划中的几项提议以迁就特殊利益集团的要求。