The four kinds of films MEH-PPV(1mg)/ml

[MEH-PPV(1mg)+TiO

2

(1mg)]/ml

[MEH-PPV(1mg)+TiO

2

(2mg)]/ml and [MEH-PPV( 1mg)+TiO

2

(3mg)]/ml were made by dip coating method.The diameters of the scatters TiO

2

are of submicrometer in all reports published before in films or solutions.Random lasing with the scatters of 20nm has been reported in this letter.The femtosecond laser through OPA hamornics produce 130fs pulse duration

544nm exciting wavelength

1kHz repeat ratio

and 3~μJ/pulse pump power.The spectrum line narrowed dramatically almost in two orders of magnitude

smaller than the spectrum lines excited by Xenon lampe.The outputs on the end of the film were exponen-tially increased with lengthening the excitation stripe of laser beam.It is shown that the amplified sponta-neous emission(ASE) is the dominant mechanism.The effects of Anderson location of light on random las-ing with the mean free path

l

=5.4×10

5

nm were discussed.