Some information would be useful like:

* how did you install Imagick.

* What version do you have installed.

* Is this a new problem? i.e. have you been able to install Imagick before, or have you never been able to install it?

If you didn't already downloading it from the windows.php.net site is probably a good idea.

ImageMagick from: http://windows.php.net/downloads/pecl/deps/
Imagick from: http://windows.php.net/downloads/pecl/releases/imagick/3.3.0/

I download imagick from http://pecl.php.net/package/imagick. i have tried 3.4.0RC2 3.3.0's 5.6 Thread Safe (TS) x64 version. i move php_imagick.dll to ext directory and add configure in php.ini. but when i run php, it echo PHP Warning:  PHP Startup: Unable to load dynamic library 'ext\php_imagick.dll'. can't find the module(i translate by myself, because the reason gived in chinese). i have been able to install Imagick when i use php 5.5. but this time i used 5.6

Please can you ensure that you have also installed ImageMagick from the link given, as Imagick depends on ImageMagick.

Additionally, please can you paste the whole error message even if it's in Chinese. Imagick is working for other people....so we need to identify what the problem is.

whole error message：
PHP Warning:  PHP Startup: Unable to load dynamic library 'ext\php_imagick.dll' - 找不到指定的模块。
 in Unknown on line 0

yes I've installed ImageMagick.

@jiepengthegreat please don't use any other ImageMagick builds than http://windows.php.net/downloads/pecl/deps/ , pointed out by @danack. The ImageMagick DLLs need to be on the %path%. Parameters for ImageMagick builds have to match with those for your PHP binary. For the CLI usage it's enough to have those DLLs in the PHP root directory. For Apache or IIS an extra configuration might be needed. Also please be sure no other ImageMagick DLLs are on the %path%.

Thanks.

when i add it to path; it work well. thank you so much

Closing as it works according to the submitter.