A new preparation method was developed to prepare Al

2

O

3

particle reinforced Cu matrix composites

where Cu powder is added into Al（NO

3

）

3

solution with dfferent Al（NO

3

）

3

concentration and stirred to be paste to be dried at 80 ℃

and then the Al（NO

3

）

3

is decomposed into Al

2

O

3

particle at 500 ℃ in hydrogen atmosphere

then the powder is heated up to composites.The effects of Al

2

O

3

content on the properties of the composites have been examined.The results show that with increasing in Al

2

O

3

content

the decreased.Meanwhile

the maximum value of the hardness of composites can be obtained with 1% Al

2

O

3

content.