Start up methods for multiple catalyst systems

The invention relates to a introduced multi-ingredient the catalyst the gas phase or slurry the method is reactor. The is preferably, comprising the following steps: Introduce the one or more of a first catalyst and activating the reactor, and wherein the olefin polymerization, the polyolefin, and non-essential activating agent is the first catalyst the second/catalyst in the activating agent composition, and wherein the olefin polymerization and after of the is introduced. The invention further claims a method to introduce the catalyst multi-ingredient the gas phase or slurry the method in the reactor, the method comprising one or more of catalyst, the first catalyst and activating agent, and second catalyst, introduced to the non-essential activating agent in the reactor, a is introduced to the reactor, all of catalyst and an activators.