How many filters does Dyson DC05 has?

My problem is fixed now, Thank you very much for your help Guys.

The DC05 has two filters.  In terms of air-flow through the machine, one sits between the bin and the vacuum motor, the other is after the motor and is effectively the exhaust filter. The one that's missing on your machine is the first filter - it consists of a blue foam disc contained within a yellow surround (the base of the surround has additional filter material built in to it). Both components are washable (but be sure everything is absolutely dry before re-installing after washing).  The filter you can see under the bin is the second (HEPA) filter. This one is usually quite long-lived but, if your machine has been used without the first filter in place, the HEPA filter almost certainly needs replacing too.  The machine should never be used without the first filter in place, as that will risk serious damage to the motor and will certainly shorten its life.  Incidentally, user manuals can be downloaded from dyson.com.