区别如下：意思不同efficient是效率高的，有能力的，可以指人举例： an efficient secretary 工作效率高的秘书effective是有效的，起作用的举例：an effective medicine for hair loss 一种治疗脱发的有效药2.名词形式不同efficient 其名词形式为efficiency，意为“效率，功效”。举例：increase efficiency of production and diminish cost of output 提高生产效率，降低产品成本effective 其名词形式为effectiveness，意为"效果，有效"。举例：The faith I placed in my doctor’s treatment perhaps helped in its effectiveness. 我对医生疗法的信任也许促进了治疗的效果。扩展资料：efficient 用法：
1.用作定语～+ n.She is anefficientmanageress. 她是一个有能力的经理。This is a highly efficient new heating system.这是个高效的新取暖系统。
2.用作表语S+be+～This machine isefficient. 这台机器效率高。I'll say this for them--I'll admit that they're efficient.我得为他们说句话——我会说他们很有能力。
3.S+be+～+ prep .-phraseShe was veryefficientin reducing waste. 她在减少浪费方面很有办法。
efficient，adj.有效率的;效率高的;有能力的;
例句
Our efficient new machines are cheaper than old ones.
effectiv，adj.产生预期结果的;有效的;实际的;事实上的;生效的;起作用的;
n.
[军]现役兵额;有生力量;精兵;
例句
Television is an effective means of communication.
电视是一种有效的通信手段