Abstract: What can we learn from the collisions of the Russian and American sate llites? It reminds us that it is now urgent for the world to lay down rules rega rding to the exploration and use of the outer space. It will keep the outer spac e activities in good order and will benefit all the countries on earth. To reach this goal, three aspects should be focused on. Firstly, the rule of mankind her itage should be emphasized again; secondly, take steps before every launch; thir dly, let the wrongdoers be liable for damages caused by their space objects. May be we really need an international organ to supervise our space activities.