It is not clear exactly what you mean here, but I will try to answer. I assume that you are talking about push and pull in terms of reasons to immigrate to Australia. Geographers usually talk about "push" as reasons immigrants have for leaving their country and "pull" as reasons they have for coming to a particular country.
I also do not know what time period you are talking about.
The main pull for Australia has historically been economic opportunity. This was true in its early days when the immigrants were European and it is true today when Asians want to immigrate. Today, political freedom is also a major pull factor for Australia.
The push factors are, of course, specific to the countries that the people come from. But they are usually poverty and political repression.