The Holy Prophet said: “Shaa’-baan is my month”.
Imam Ali bin Husayn Al Zanul Aabideen (A.S.) told his companions: “The Holy Prophet (S.A.) used to observe fast during the whole month of Shaa’-baan. Therefore whosoever, in love of the Holy Prophet (S.A.), wishes to seek nearness to Allah and receive bounties, favours and rewards in this world and in the Hereafter, must connect Shaa’-baan with Ramazaan (in the matter of fasting and special prayers). 1)
It is highly desirable to observe fast on 1st, 2nd and 3rd Shaa’baan, & Pray every night a 2 Rak-a’t Namaaz..In every Rak-a’t, after the recitation of Soorah Al Faatih’ah, recite Soorah Al Ikhlaas 11 times..
2) Give Alms/Charity in HIS name
3) Recite 70 times:-
اَسْتَغْفِرُاللهَ وَ اَسْئَلُهُ التَّوْبَةَ
I seek forgiveness of Allah, and, repentant, beseech Him.
ASTAGFIRULLAAHA WA AS-ALUHUT TAWBAH
اَسْتَغْفِرُاللهَ الَّذى لا اِلهَ اِلاّ هُوَ الرَّحْمنُ الرَّحیمُ الْحَىُّ الْقَیّوُمُ وَ اَتُوبُ اِلَیْهِ
I seek forgiveness of Allah who is “There is no God save He”, the Beneficent, the Merciful; the Everliving, the Eternal, and I turn repentant to Him
ASTAGHFIRULLAAHALLAD’EE LAA ILAAHA ILLA HUWAR RAHMANO RAH’EEMUL H’AYYUL QAYYOOMU WA ATOOBU ILAYHI
4) Recite the following 1000 times, whenever the count reaches 1000, at any time within the month, the a’mal is complete:
لا اِلهَ اِلا اللّهُ وَلانَعْبُدُ اِلاّ اِيّاهُ مُخْلِصينَ لَهُ الدّينَ وَ لَوُ كَرِهَ الْمُشْرِكُونَ
There is no god save Allah. We do not worship save “He” alone, making religion pure for Him (only), however much the disbelievers be averse.
LAA ILAAHA ILLALLAAHU WA LAA NAA’-BUDU ILLAA IYYAAHU MUKHLIS’EENA LAHUD DEEN WA LAW KARIHAL MUSHRIKOON
5) On every Thursday Fasting is recommended & Recite 2 Rak-a’t Namaaz. In every Rak-a’t, after the recitation of Soorah Al Faatih’ah, recite Soorah Al Ikhlaas 100 times. After the Salaam recite Salawaat 100 times .اللّهُمَّ صَلِّ عَلَى مُحَمَّدٍ وَآلِ مُحَمَّدٍ
In this respect, a Hadith reads that the heavens decorate themselves each Thursday in Sha`ban and the angels pray Almighty Allah, saying, “O our God: (please do) forgive him who observe fasting on this day and respond to his prayers.”
6) Recite the Special Salawaat taught by Imam Ali bin Husayn Al Zaynul Aabideen (A.S.)
7) Recite Munajat e Shabaniyah with presence of heart .
source : sibtayn